ATA559001-6DSY Atmel, ATA559001-6DSY Datasheet - Page 36

• Manufacturer Part Number: ATA559001-6DSY
• Description: RF Wireless Misc UHF (1k bit r/w anti-collision)
• Manufacturer: Atmel

Specifications of ATA559001-6DSY

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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ATA5590
ATA5590 supports several commands to solve collision problems deterministically. ATA5590
distinguishes between deterministic anticollision and the group-selection mechanism. The deter-
ministic anticollision procedure of ATA5590 is based on a flexible binary tree algorithm which is
characterized by:
During arbitration, the procedure is based on full duplex communication to enable closed loop
arbitration. Therefore, during arbitration the reader is able to control and to change priority
bit-by-bit.
If the CRC condition is true, at the end of each arbitration procedure a group of tags or a single
tag is automatically selected. The contents of the memory which was part of the arbitration is
also known. There is no need for an additional acknowledgement to the tag. The reader can
communicate immediately with the selected tags.
The deterministic anticollision procedure which is implemented in ATA5590 does not expect
unique data structures, such as an ID, for arbitration, because ATA5590 also supports random
frames during arbitration.
The arbitration process itself is also based on a PIE style. The reader transmits a reference time
first (return link header section). Then, during arbitration, the tag compares the time between two
bits with this reference. If the bit time is less than the reference time, a “0” was transmitted, oth-
erwise a “1”. This value will be compared against the internal bit value of the EEPROM. If the
values are the same, the tag has won the arbitration for this bit, and is enabled for further steps.
If not, the tag has lost the arbitration, and waits on a new arbitration command. Up to this time,
the tag is silent, and not available for programming or reading.
• A modified deterministic binary tree algorithm, and
• Full duplex communication
4817C–RFID–03/07